EP3157113A1 - Dispositif de protection d'un défaut d'isolement dans un réseau électrique non mis à la masse - Google Patents

Dispositif de protection d'un défaut d'isolement dans un réseau électrique non mis à la masse Download PDF

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Publication number
EP3157113A1
EP3157113A1 EP16192305.7A EP16192305A EP3157113A1 EP 3157113 A1 EP3157113 A1 EP 3157113A1 EP 16192305 A EP16192305 A EP 16192305A EP 3157113 A1 EP3157113 A1 EP 3157113A1
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EP
European Patent Office
Prior art keywords
insulation
power supply
supply system
shutdown
monitoring device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16192305.7A
Other languages
German (de)
English (en)
Inventor
Wolfgang Hofheinz
Harald Dipl.-Ing. SELLNER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bender GmbH and Co KG
Original Assignee
Bender GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bender GmbH and Co KG filed Critical Bender GmbH and Co KG
Publication of EP3157113A1 publication Critical patent/EP3157113A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
    • H02H3/17—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass by means of an auxiliary voltage injected into the installation to be protected
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
    • G01R27/18—Measuring resistance to earth, i.e. line to ground
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
    • H02H3/162—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass for ac systems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
    • H02H1/003—Fault detection by injection of an auxiliary voltage

Definitions

  • the invention relates to an insulation fault protection device for an ungrounded power supply system, with a standard insulation monitoring device for monitoring an insulation resistance of the ungrounded power supply system.
  • Insulation monitoring devices specified in accordance with the international standard IEC 61557-8, which are used to monitor the insulation resistance in ungrounded power supply systems (French Isodia Terre IT systems), are known.
  • the particular advantage of IT systems is that no shutdown (disconnection) of the power supply system is made, thus ensuring a continuous power supply to the powered by the IT power supply consumer even if, for example, caused by a ground fault or a body contact
  • the first insulation fault occurs because the active parts of the IT power supply system are disconnected from the earth potential - compared to "ground” - and in this first fault case no closed circuit can form. It flows only a mostly very small capacitive fault current, which is determined by the system leakage capacitance of the line system of the IT system.
  • the present invention is therefore based on the object to provide an electrical protective device for an ungrounded power supply system, which fulfills next to an insulation monitoring a more protective function when a first insulation fault occurs.
  • an insulation fault protection device for an ungrounded power supply system with a standard An insulation monitoring device for monitoring an insulation resistance of the ungrounded power supply system and with a disconnection device for disconnecting the power supply system, wherein the disconnection device is connected by a signal line with the insulation monitoring device and in the case of a detected by the insulation monitoring device first insulation fault, the insulation monitoring device outputs a shutdown signal via the signal line to the shutdown device ,
  • the insulation fault protection device By combining an insulation monitoring device with a shutdown device, the insulation fault protection device according to the invention combines the monitoring function of a normatively prescribed insulation monitoring with the protective function of a fault current protection device. If the insulation monitoring device according to its determination falls below an adjustable and adapted to be monitored IT power supply system insulation resistance limit, which corresponds to the occurrence of a first insulation fault, the insulation monitoring device outputs a shutdown signal via a signal line directly to the shutdown and it is done by means of the disconnection device, a separation of the power supply for connected to the ungrounded power supply system consumers.
  • the insulation fault protection device according to the invention thus includes not only the function of the insulation resistance monitoring but also a disconnecting function, as it is known from residual current protective devices.
  • the information about the detection of a first insulation fault by the insulation monitoring device is advantageously used directly in the shutdown device for the separation of the power supply system.
  • the detection of symmetrical and asymmetrical insulation faults by the insulation monitoring device ensured on the basis of the prescribed measuring characteristics represents a significant safety advantage.
  • the insulation fault protection device according to the invention as a safety-related system in the form of insulation monitoring device with shutdown device also allows further applications for ungrounded systems, which are previously reserved only grounded systems because of the unavailable for ungrounded systems protection devices.
  • the insulation fault protection device according to the invention is equally suitable for AC and DC power supply systems.
  • the costly measurement technique based on the differential current measurement principle can be dispensed with for the detection of DC residual currents or for the detection of alternating fault currents with DC component in conventional residual current protective devices (RCD).
  • the shutdown device has a contact set for the separation of conductors of the power supply system.
  • the insulation fault protection device thus meets the same safety standards as a residual current device.
  • the standard insulation monitoring device and the shutdown device form a common structural unit.
  • the insulation fault protection device thus represents a structural unit in a compact form, which makes their practical use, for example in an installation, simple.
  • Fig. 1 schematically shows the installation of an insulation fault protection device 2 according to the invention in an ungrounded AC power supply system 4 with two conductors L1 and L2 shown.
  • a first insulation fault R F has occurred between the conductor L1 and the body of the equipment 6, resulting in a fault current I F.
  • the fault circuit includes in parts via a protective conductor PE with a protective conductor resistance R PE and a resistance R AE of an earth electrode 10 connected to earth 8 and cable and line capacitances C E and natural leakage capacitances C N.
  • the insulation fault protection device 2 comprises a standard functional safety insulation monitoring device 12, which fulfills the requirements stipulated, for example, in the international standard IEC 61557-8. This is superimposed between the Conductors L1, L2 and the protective conductor PE connected insulation monitoring device 12 the power supply system 4 actively a measurement voltage, which adjusts the insulation resistance corresponding measurement current, which in turn has a measurable in the insulation monitoring device 12 voltage drop result. In the case of the insulation fault R F shown here, the insulation resistance drops below a characteristic value which can be set for the power supply system 4 to be monitored.
  • a shutdown device 14 provided according to the invention, which is directly connected to the insulation monitoring device (12) by means of a signal line (16), activates the separation of the power supply system 4.
  • the shutdown device 14 can be arranged as an integral part of the insulation fault protection device 2 in a common housing with the insulation monitoring device 12.
  • Fig. 2 shows the application of an insulation fault protection device 2 according to the invention on the example of a charging of an electrical energy storage device 22 of an electric vehicle 24 with an electrical equipment 26 ("Electrical Vehicle Supply Equipment” - EVSE) via an ungrounded DC power supply system 20.
  • an electrical equipment 26 Electronic Vehicle Supply Equipment
  • - EVSE Electric Vehicle Supply Equipment
  • the decrease in the insulation resistance due to the first insulation fault R F occurring between the conductor L1 and the protective conductor PE is detected by the insulation monitoring device 12 of the insulation fault protection device 2 and then output via the signal line 16 to the turn-off device 14. This separates the conductors L1, L2 of the power supply system 20.
  • the insulation fault protection device 2 according to the invention can be part of a DC charging station 28.
  • the use of the insulation fault protection device 2 according to the invention is associated with significant advantages. So the application can be switched off DC-IT system 20 allow a reduction of the conductor cross-section of the protective conductor PE in the charging station 28. Particularly at very high charging voltages and charging currents, the design of the protective conductor cross-section of volume and weight reasons is of importance.
  • the fault current I F can be used to calculate the cross section of the protective conductor PE.
  • the maximum switch-off time of the IT system 4, 20 can be based on the switch-off time of the IEC 61557-8 standard of 100 seconds. There is no reason to expect a second error on another conductor within this shutdown time since the simultaneous occurrence of two independent and non-related errors can normally be disregarded because the likelihood of such an event is so low that the risk is generally tolerated can.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
EP16192305.7A 2015-10-16 2016-10-05 Dispositif de protection d'un défaut d'isolement dans un réseau électrique non mis à la masse Withdrawn EP3157113A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015117678.5A DE102015117678A1 (de) 2015-10-16 2015-10-16 Isolationsfehler-Schutzeinrichtung mit Abschaltfunktion für ungeerdete Stromversorgungssysteme

Publications (1)

Publication Number Publication Date
EP3157113A1 true EP3157113A1 (fr) 2017-04-19

Family

ID=57189758

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16192305.7A Withdrawn EP3157113A1 (fr) 2015-10-16 2016-10-05 Dispositif de protection d'un défaut d'isolement dans un réseau électrique non mis à la masse

Country Status (3)

Country Link
EP (1) EP3157113A1 (fr)
CN (2) CN106816856A (fr)
DE (1) DE102015117678A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019130163A1 (de) * 2019-11-08 2021-05-12 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Ladevorrichtung zum Aufladen einer Traktionsbatterie eines Elektrofahrzeugs

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015117678A1 (de) * 2015-10-16 2017-04-20 Bender Gmbh & Co. Kg Isolationsfehler-Schutzeinrichtung mit Abschaltfunktion für ungeerdete Stromversorgungssysteme
DE102017217473B3 (de) * 2017-09-29 2019-01-17 Bender Gmbh & Co. Kg Verfahren und Überwachungsvorrichtung zur selektiven Bestimmung einer Teil-Netzableitkapazität in einem ungeerdeten Stromversorgungssystem
CN109406879A (zh) * 2018-12-11 2019-03-01 上海华宿电气股份有限公司 绝缘检测装置及系统
DE102019109260B4 (de) * 2019-04-09 2021-06-17 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Verfahren zum Laden eines Fahrzeugs und Fahrzeug
DE102019130421A1 (de) * 2019-11-12 2021-05-12 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Traktionsbatterie-Ladestation
CN116454839A (zh) * 2023-04-27 2023-07-18 合肥盎牛智能装备有限公司 一种绝缘检测接地控制方法

Citations (3)

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Publication number Priority date Publication date Assignee Title
DE1463610A1 (de) * 1964-07-10 1969-10-23 Siemens Ag Ungeerdetes Wechselstromnetz mit Erdschlussueberwachung
US6879164B2 (en) * 2002-02-09 2005-04-12 Ballard Power Systems Ag Method and device for insulation monitoring of a DC network
DE202011004515U1 (de) * 2011-03-30 2011-10-07 Dipl.-Ing. Walther Bender Gmbh & Co. Kg Vorrichtung zum sicheren Betrieb einer Ladestation mit Rückspeisung

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010006108A1 (de) * 2010-01-29 2011-08-04 Bayerische Motoren Werke Aktiengesellschaft, 80809 Bestimmung einer Isolation in einem IT-System
DE102010039692A1 (de) * 2010-08-24 2012-03-01 Dipl.-Ing. Walther Bender Gmbh & Co. Kg Gerät zur Isolationsüberwachung eines nicht geerdeten Gleichspannungsnetzes, besonders einer Fotovoltaikanlage, und Anlage mit einem solchen Gerät
DE102013226595A1 (de) * 2013-12-19 2015-06-25 Bender Gmbh & Co. Kg Vorrichtung zur Isolationsüberwachung
DE102014204038A1 (de) * 2014-03-05 2015-09-10 Bender Gmbh & Co. Kg Verfahren und Vorrichtungen zur selektiven Isolationsüberwachung in ungeerdeten IT-Stromversorgungssystemen
DE102015117678A1 (de) * 2015-10-16 2017-04-20 Bender Gmbh & Co. Kg Isolationsfehler-Schutzeinrichtung mit Abschaltfunktion für ungeerdete Stromversorgungssysteme

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1463610A1 (de) * 1964-07-10 1969-10-23 Siemens Ag Ungeerdetes Wechselstromnetz mit Erdschlussueberwachung
US6879164B2 (en) * 2002-02-09 2005-04-12 Ballard Power Systems Ag Method and device for insulation monitoring of a DC network
DE202011004515U1 (de) * 2011-03-30 2011-10-07 Dipl.-Ing. Walther Bender Gmbh & Co. Kg Vorrichtung zum sicheren Betrieb einer Ladestation mit Rückspeisung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019130163A1 (de) * 2019-11-08 2021-05-12 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Ladevorrichtung zum Aufladen einer Traktionsbatterie eines Elektrofahrzeugs

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DE102015117678A1 (de) 2017-04-20
CN206379713U (zh) 2017-08-04
CN106816856A (zh) 2017-06-09

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